Preheat your oven to 425°F (220°C).
Roll out one pie crust and place it in a 9-inch pie dish.
In a large bowl, combine sliced strawberries and chopped rhubarb.
Add sugar, cornstarch, lemon juice, vanilla extract, and salt. Mix well.
Pour the fruit mixture into the prepared pie crust.
Dot the filling with small pieces of butter.
Roll out the second pie crust and cut it into strips.
Weave the strips over the filling to create a lattice top.
Trim and crimp the edges of the pie crust.
Bake for 35-45 minutes until the crust is golden and the filling is bubbly.